Year	years
1960	65.86053658536586
1961	65.87714634146343
1962	65.25565853658537
1963	67.07170731707318
1964	67.84512195121953
1965	67.70726829268293
1966	68.89765853658538
1967	67.51595121951219
1968	67.56036585365854
1969	66.69207317073172
1970	67.48241463414635
1971	68.50414634146341
1972	68.47024390243904
1973	69.00560975609757
1974	69.49975609756099
1975	69.6139024390244
1976	69.69878048780488
1977	69.7419512195122
1978	69.48048780487805
1979	69.15317073170733
1980	69.09097560975611
1981	69.36829268292684
1982	69.53170731707318
1983	69.72634146341466
1984	69.65878048780489
1985	69.7068292682927
1986	69.49634146341464
1987	69.22682926829269
1988	69.38804878048781
1989	69.53073170731709
1990	69.74121951219513
1991	69.78439024390244
1992	69.78439024390244
1993	69.56341463414635
1994	69.50975609756098
1995	69.4560975609756
1996	69.10487804878049
1997	69.0048780487805
1998	69.80731707317075
1999	70.51219512195124
2000	71.16341463414635
2001	71.16097560975611
2002	71.00975609756098
2003	71.30975609756098
2004	71.5609756097561
2005	71.91219512195123
2006	72.16341463414635
2007	72.56585365853658
2008	72.56585365853658
2009	73.30975609756098
2010	73.45853658536586
2011	74.40975609756099
2012	74.41219512195123
2013	75.06341463414634
2014	74.90975609756099
2015	74.91219512195123
2016	75.20975609756098
2017	75.20975609756098
2018	75.35853658536587
2019	75.60731707317073
2020	74.25365853658539
2021	72.80975609756098
2022	75.3048780487805